Abstract

The J/ψ pT spectrum and nuclear modification factor (RAA) are reported for pT < 5 GeV/c and |y| < 1 from 0% to 60% central Au + Au and Cu + Cu collisions at √SNN = 200 GeV at STAR. A significant suppression of pT-integrated J/ψ production is observed in central Au + Au events. The Cu + Cu data are consistent with no suppression, although the precision is limited by the available statistics. RAA in Au + Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with pT. The data are compared to high-pT STAR results and previously published BNL Relativistic Heavy Ion Collider results. Comparing with model calculations, it is found that the invariant yields at low pT are significantly above hydrodynamic flow predictions but are consistent with models that include color screening and regeneration.

Document Type

Article

Publication Date

8-12-2014

Notes/Citation Information

Published in Physical Review C: Nuclear Physics, v. 90, no. 2, article 024906, p. 1-13.

©2014 American Physical Society

The copyright holder has granted permission for posting the article here.

Collectively the authors are known as the STAR Collaboration. Due to the large number of authors involved, only the first 10 and the ones affiliated with the University of Kentucky are listed in the author section above. For the complete list of authors, please download this article or visit the following link: https://doi.org/10.1103/PhysRevC.90.024906

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevC.90.024906

Funding Information

This work was supported in part by the Offices of NP and HEP within the US DOE Office of Science, the US NSF; CNRS/IN2P3; FAPESP CNPq of Brazil; the Ministry of Education and Science of the Russian Federation; NNSFC, CAS, MoST, and MoE of China; the Korean Research Foundation; GA and MSMT of the Czech Republic; FIAS of Germany; DAE, DST, and CSIR of India; the National Science Centre of Poland; National Research Foundation (Grant No. NRF-2012004024), the Ministry of Science, Education and Sports of the Republic of Croatia; and RosAtom of Russia.

Additional Files
Fig 1.png (336 kB)
Figure 1
Fig 2.png (363 kB)
Figure 2
Fig 3.png (82 kB)
Figure 3
Fig 4.png (101 kB)
Figure 4
Fig 5.png (106 kB)
Figure 5
Fig 6.png (112 kB)
Figure 6
Fig 7.png (93 kB)
Figure 7
Fig 8.png (90 kB)
Figure 8
Fig 9.png (149 kB)
Figure 9
Fig 10.png (94 kB)
Figure 10
Fig 11.png (152 kB)
Figure 11
Fig 12.png (132 kB)
Figure 12
Fig 13.png (122 kB)
Figure 13
Fig 14.png (92 kB)
Figure 14
Table 1.GIF (55 kB)
Table 1
Table 2.GIF (33 kB)
Table 2
Table 3.GIF (44 kB)
Table 3
Table 4.GIF (156 kB)
Table 4
Table 5.GIF (72 kB)
Table 5
Table 6.GIF (61 kB)
Table 6
Table 7.GIF (39 kB)
Table 7
Download

Additional files available below

Share

COinS